27aYH-2 不凍糖タンパク質による排除体積効果を考慮した2次元DLA成長II : 不純物パーコレーションと氷成長の競合(結晶成長,領域9,表面・界面,結晶成長) 27aYH-2 Retardation of the growth velocity on the two-dimensional diffusion limited aggregation due to the excluded volume effect of the antifreeze glycoprotein II : Competition between the growth of DLA-duster and the increase of the impurity-coverage